SAE 15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil
Premium Protection for Severe-Service Diesels
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is a premium diesel oil that provides excellent performance in all types of diesel engines without exhaust aftertreatment systems, where effective control of wear and deposits is crucial. Engineered with heavy-duty dispersant/detergent additives, its Total Base Number (TBN) of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by, protecting against corrosion, cylinder bore polishing (wear), varnish, and sludge deposits. AMSOIL 15W-40 Diesel Oil resists heat and breakdown better than conventional petroleum oils, ensuring long-lasting performance and protection.
Extends Drain Intervals
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil can significantly extend drain intervals beyond those recommended for conventional petroleum oils. Its unique synthetic formulation and long-drain additive chemistry provide maximum engine protection, cleanliness, and performance over extended drain periods, thereby reducing vehicle maintenance and waste-oil disposal costs.
Controls Soot and Wear
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil is fortified with detergent/dispersant additives and is naturally resistant to soot. It is designed to keep soot particles suspended independently, preventing them from aggregating into larger, wear-causing particles. This minimizes viscosity increase and reduces wear related to soot.
Reduces Oil Consumption and Emissions
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil has lower volatility compared to conventional petroleum oils, minimizing oil consumption and emissions by reducing vapor passage into the combustion chamber. Lower volatility helps AMSOIL 15W-40 Diesel Oil maintain viscosity after high-temperature service, ensuring consistent and reliable protection.
Excellent Cold-Flow Properties
AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil facilitates easy cold-weather starting and provides essential startup lubrication to prevent engine wear. It surpasses conventional 15W-40 petroleum oils, mitigating the effects of cold-weather operations.